How do Tadpole galaxies get their shapes?
A: They form in a region of chaotic spacetime expansion.
B: They're spreading out on their own due to internal pressures.
C: They are the results of ellipticals with powerful x-ray jets coming from their cores.
D: They were fully-formed spiral galaxies before, and lost some arms to black holes.
E: They respresent merging galaxies.
Ans: E: They respresent merging galaxies.
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What, according to the chapter, is the essence of the paradox in Schrödinger’s cat paradox?
A. Opening the box (and thus observing the cat) might kill it, contrary to our experience of reality. B. The cat, though it should be described by quantum mechanics, never displays the features of a superposition state, like microscopic systems do. C. The cat being alive or being dead are not mutually exclusive possibilities, contrary to what we think. D. Human consciousness is necessary to collapse the cat’s state to being alive or dead. E. Something else (explain).
An atom gained an electron. Therefore, it has been ionized
a. True b. False Indicate whether the statement is true or false
In the double-slit experiment with light, each photon impact occurs within an overall two-slit interference pattern. Thus, each photon "knows" that both slits (rather than only one) are open. This behavior is known as
A) quantum interference. B) quantum reality. C) quantum tunneling. D) quantum nonlocality. E) quantum randomness.
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S1 and S2 is zero at this instant, and the waves shown arriving at P2 both arrive with amplitude A, the difference in phase angle at point P2 (in radians) is
?
?
A. 0. B. ?/2. C. ?. D. 3?/2. E. 2?.